If you are asking yourself why is my resin bendy, there are a few reasons why this can happen:
Resin needs more time to cure
While a resin is curing, it will no longer be liquid, but can be soft and pliable. If this is happening to you, double-check the cure time for your resin. With any luck, you simply need to give it more time to dry.
If you are unsure what drying time and curing time mean, this article explains more: How long does it take resin to dry?
Resin poured in a thin layer
It can be normal for some resins, when poured in a thin layer, to be bendy. Some resins, especially doming resins, can be flexible after the full cure time. It may firm up by giving it more curing time, but that doesn’t always work. If you want to give the resin extra time to cure, make sure it stays warm and give it another two to seven days to fully cure.
If you aren’t sure what the ideal resin curing temperature is, this will help: Resin mixing and curing temperatures
The resin is retaining moisture
Sometimes when you use colorants not designed for resin, they will retain water in your castings. This water will keep your resin soft and may even not cure completely. If this has happened to you, be sure to check out the article how to color epoxy resin.
It may be normal for this resin
In general, some resins, especially epoxy resins do not cure hard. These resins can be bendy when poured in a thin layer or can be dented with a fingernail for thicker pours.
The resin may be old
Old resin kits can collect moisture that is impacting the curing. You will know if your kit is old if it’s past its expiration date or if either or both of the component bottles are dark yellow. If this happens to you and you decide you no longer want to use the resin kit, be sure you dispose of it properly. Here’s how: How to dispose of resin
Here is a recent video I made where I answer the question why is my resin bendy —
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